WoodLow-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Odeon (Index 804)
Value from the PTB table, not verified
4 mm asbestos or plywood boards fastened at random intervals (at least 0.4 * 0.6 m), over 75 mm cavity with 25 mm mineral wool
PTB reference data
Original description
4 mm asbestos or plywood boards fastened at random intervals (at least 0.4 * 0.6 m), over 75 mm cavity with 25 mm mineral wool
Material properties
Thickness: 0.2 in
Wall distance: 3 in
Dimensions: at least 0.4 × 0.6 m
Backing: 1 in mineral wool
Mounting: fastened at random intervals
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.15
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.20 | 0.10 | 0.05 | 0.00 | 0.00 | 0.00 |
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Value from the PTB table, not verified
NRC: 0.15 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 63 Hz | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz | 5000 Hz | 6300 Hz | 8000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.15 | 0.55 | 0.00 | 0.55 | 0.00 | 0.00 | 0.30 | 0.00 | 0.00 | 0.10 | 0.00 | 0.00 | 0.05 | 0.00 | 0.00 | 0.05 | 0.00 | 0.00 | 0.05 | 0.00 | 0.00 | 0.05 |
Measured values as a table (1 measurement)
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